This research entitled Speech Errors on Sandiaga Uno’s Speech at Yusuf Ishak Institute. The aim of this research is to find out the types and the causes of speecherror made by Mr. Sandiaga in delivering speech at Yusuf Ishak Institute by applying Clark and Clark’s (1977) theory. Clark and Clark identified nine types of speech error: silent pause, filled pause, false start (un-retraced),…